Tool-retainer.



W. H. ARMSTRONG. TOOL RETAINER; APPLICATION FILED OCT. 29, I913.

1,188,383 I PatentedJumQY,191C.

2 SHEETSSHEET I.

5] mm vwoz W. H. ARMSTRONG.

TOOL RETAINER.

APPLICATION FILED OCT. 29. i9l3. 1,1 8.3. I Patented June 27, 1916.

2 SHEETSSHEET 2.

which are shown in WILLIAM H. ARMSTRONG, 0F BLAINFIELD, NEW JERSEY, ASSIGNOR TO INGERSOLL- BAND COMPANY, OF JERSEY CITY, NEW JERSEY, A COEPORATION OF NEW JERSEY.

TOOL-RETAINER.

Specification of Letters Patent.

mama June 27, rate.

Application filed October 29, 1913. Serial No. 797,986.

Toall whom it may concern:

Be it known that I, VILLIAM; H. ARM- STRONG, a citizen, of the United States, residing at Plainfield, in the county of Union and State of- New 'Jersey, have invented a certain new and useful Improvement in Tool-Retainers, of which the following is a specification.

shown as two) tool retaining dogs 9- In This invention relates to tool retainers f for percussive tools and more particularly to such a retainer for use in holding in the rivet set in a riveting hammer.

The object of the invention 1s to provide such a retainerwhich will be of com-" paratively simple construction and yet capable of bearing the great stress which;

these-retainers are often subjected to, for such a period ofv time that any chance of apcident will be-practically eliminated.

With this object in view, I have devised a tool retainer, practical embodiments'of the. accompanying drawingsin which: Figure 1 shows a longitudinal section through the front-end of a riveting hammer cylinder'showing the rivet retainer inposition'fFig. 2 is a transverse section taken on the'linc IIII of Fig. 1, Fig. 3 is a'fron't elevation of a tool and rivet retainer with the headof the rivet'set cut away, Fig. l is a top view of the retainer, Fig. 5 is a longitudinal section through a modified form of retainerand Fig. 6 is an end elevation of the retainer shown in Fig. 5.

In the drawings is shown the front end of a tool cylinder 1, the tool being of ordinary construction and provided with a rivet set 2 of ordinary construction which comprises a shank 3 sliding in the forward end of this cylinder, at the forward end of which is a flange 4 which serves to limit the backward movement of the rivet set and also to pro vide a holding surface for the retainer. 1

The retainer proper consists of' a sleeve 5 whose interior diameter, for a greater part of its length, is greater than the outer diameter of the tool barrel and which is provided at its rear end with an inturned.

' flange portion 6 which slides on the surface of the tool cylinder. The forward part of the sleeve slides on an annular flange or projection 7 which is threaded or otherwise secured, to the extreme end of the tool barrel. Surrounding the tool barrel inside of the sleeve 5 is a spring 8 which is shown in Figs. 1 to at these dogs are shown as having rectangular rear portions 10' and necks 11 which fit into inwardly out slots 12 in the forward part of the sleeve 5, the shoulders 13 of the rear portions 10 preventing for- Ward movement of the dogs-in the sleeve and providing pivot points for them. The. forward parts of the dogs 9 widen out and turn inwardlyforming jaws 14 for grasping the rivet set, contact of the flange 4 with these jaws preventing anything more than limited forward movement of the rivet set. The inner faces of the rear portions 10 of the dogs 9 are provided with projecting surfaces 15 which are adapted to ride up on p the outer surface of the spring 8 when the dogs 9 and the sleeve 5 move forward under the impact of the flange 4 of the rivet set against'the jaws 14. In this way the jaws 14 will be forced into close contact with the neck of the rivet set preventing-it. from fiy v does not move as the jaws 14 are not in contact with the flange 1 of the rivet set. .If,

however, the motive fluid of the tool. is

turned on when the rivet set is not in contact with the work, the rivet set will move forward and the flange 4 coming in contact "agoinsi; the springs so tile-i;

secured in lugs .gliorm the dogs are noino, contact in operativeposithe i hennnen il. piston 52" i when e no revee the sleeve and dogs are moved so" weir reei nsost positions and the rear ends o the dogs pushed inwardly she rivet set can bedemoved,

In Figs. in which the dogs 9 are pivoaed on pins 18 ll- 'on the 5. Y In this with the Spring 8 but are retained fsion'by. heavy fist springs 20 which press outwardly:ng einst their rear ends,

' Althou li she retainer .is here shown in s m 1 v 1 connection Wlijil e-rlveting ljOOl, it is adapt- 'Qd ffllj use with any form of percussivetool .a tool cylinder, msleeve 'pivotslly mounted in and. resilient means for or 'drill where the tool held in the cylinder and it is to bennder-' stood than the present showing and dc scrrptron discloses only certain specified modifications of my invention and other terms and modifications are included in the spirit and scope or the invention as expressed in the claims What I claim is: v 1. In a tool retainer for percussive tools, slidebly mounted the tool cylinder, one tool grasping jaws said sleeve, means to into Contact with tl ie tool, opposing forward on the forward end of or more dogs having force said ja ws motion of said sleeve.

2.111 e, tool retainer for percussive tools, a tool cylinder, e sleeve having an inturned flange, slidebly mounted on theforward end of the tool cylinder, a, spring inside of said sleeve, a projection on the cylinder end to hold said spring'l rom forward movement, one or more dogs having jaws adapted to engdge the tool pivotslly mounted in said sleeve, endineans to hold said jaws in c0ntaciwish said tool.

or drill is loosely,

5 and 15,-, s'ni'odilied form isshown messes 3. In a tool retainer for percussive tools, o tool cylinder, a sleeve having an inizurned said sleeve being slidshly mounted on the forward end of the'tool'cylinder, s.

vprojecition onthe' extreme forward end oiv sleeve, said dogs having tool grasping jaws, and rear portions adapted to ride on sand spring and-force said jows'inwardly during forwardmovcment of said sleeve. 7

5. In a toolvretainer for percussiveifiools, a tool cylinder, aprojejction on the forward end of the toolcylinder, a sleeve slidolily mounted on the forward end of the tool cylinder and having an inturned portion, a

short spring inside of said sleeve besween said inturned portion and said projection, one or more dogs plvotally mounted 1X1 said sleeve, said dogs having tool gin'sping jaws and rear portions out of Contact with said spring \Vl1811, l3h8 sleeve IS in its 'i'eei inost position, and adapted to ride up and resilient means to hold said times in contact with thefiool. I

In testimony whereof, I have hereunto set my hand. v

WILLIAM H. ARMSTRQN Witnesses STANLEY A. .Knmornl, 'iriioefl lfinonsrson,

jaws at eli pro ection, one

an annular projecon said spring during forward motion of said sleeve, 

